Typewriting machine



. ,1 v w. A. DOBON 1,988,940

TYPEWRITING MACHINE Filed May 25, 1930 2 Sheets-Sheet l In van/0r:

Jan. 22, 1935. w. A. DOBSON 1,988,940

TYPEWRITING MACHINE Filed May 23, 1930 2 Sheets-Sheet 2 Patented Jan. 22, 1935 UNITED STATES PATENT OFFICE v I A 1,988,940 1 TYPEWRITING MACHINE William A. Dobson, Bridgeport, Conn., assignor to Underwood Elliott Fisher Company,jNew York, N. Y., a corporation of Delaware Application May 23, 1930, Serial No. 454,871

3 Claims.

This invention relates to portable typewriting machines of the Underwood class, and more particularly to the framework and supporting means of the machine.

5 The opposite side walls of the inner frame are punched from sheet-steel, which, on account of its thinness, occupies but little room, and the side walls are connected at the rear by a vertical wall also of sheet-steel.

Each side wall is stamped originally in the form of a flat blank, and back ears upon the side walls are bent inwardly, and the ends of the rear sheet-metal walls are fastened to said ears.

The middle of the outer rear wall of the mask is fastened to the rear wall of the inner frame. At the sides of the outer frame or mask, near the keyboard, are lugs extending inwardly, and fastened up by screws to ears that are bent in from the side walls of the inner frame. These three fastenings may be suflicient for securing the two frames to each other.

In the present practice, owing to the built-up construction of the main frame, there frequently occur small variations in the position of the cross-bar which connects the main frame sides, and also serves as a support for the type-bar segment. Owing to this manufacturing variation, it is necessary to fit each segment to its cross-bar. This is usually done by filing the seg- 30 ment to correct its faulty position. This is an expensive fitting, and it becomes impracticable to use the same segment in a different machine, or to use a segment interchangeably either in manufacturing or in carrying them in stock. One of the objects of the invention is to overcomethis difficulty.

In carrying out this aim, the cross-bar is machined to its proper final shape, and then the machine-finished segment is fastened thereto. 40 The unit consisting of the cross-bar and the segment is then positioned in the framework,

and screws draw the ends of the cross-bar against the inner faces of the side frames. If, upon testing, it is found that the segment is a trifle out of place, then the fastening screws at the ends of the cross-bar may be loosened, and one end of the cross-bar shifted a little forwardly or backwardly, to bring the segment to exactly its right position. Then the screws may be fastened. and dowel-pins may be extended through the side frames into the ends of thecross-bar. It will be understood that the screw-holes in the side frames are made a little oversize, in order to permit this trifling adjustment of said cross-unit, which is effected before the dowel-pin holes are drilled.

The steel side walls, owing to the strength of the metal, may be formed with large clearance holes, thus rendering the entire mechanism more 5 readily accessible.

Another transverse connection between the side walls is in the form of a light bar of U-section, which serves as an anchorage for the keylever-returning springs, and at its ends is fas- 10 tened to flanges or ledges which are turned in from the bottom edges of the side plates. A single screw may be used for holding the end 7 of the transverse bar down upon the base, and for stiffness an additional screw is preferably 5 used to fasten each end of the cross-bar to the ledge.

For supporting the machine, there are employed four rubber feet. The two rear feet are fastened up against short flanges or ledges which 20 are bent in from the bottom edges of the side walls. At the front of the frame the arms are bent in on the side flanges, and the bottom portions of these arms are bent forwardly and apertured to receive rubber feet. 25

At the rear, there is provided upon the baseboard an eye, and a hook depends from the middle of the rear wall of the inside frame and isbent backwardly into the eye. This device is all confined within the mask. 3

In order to avoid complaints of jamming of the fastening screw, which fastens the rear outer wall to the rear inner frame wall, the latter has been provided with a dowel or stud which extends into a hole in the outer wall, and the two frames are securely held by means of the screws, above mentioned, at the sides of the machine. In detaching one frame from the other, it is only necessary to take out the bottom screws and then pull the rear walls apart.

The lower edge of the rear wall is bent inwardly and then downwardly to form a flange which is made to do duty for a fulcrum for the type-bar operating key-levers of the typewriter. The notched rear edges of the key-levers are pressed up against the lower edge of said wall by means of the aforesaid springs which are anchored upon the aforesaid cross-bar.

Provision is made for readily attaching any keylever and for locking all the key-levers against 59 displacement when restored. A locln'ng rod is formed upon the bottom of the key-lever-guiding comb, this bar being formed by bending back the lower edge of the vertical plate in which the keylever-guiding slots are formed. This plate is 55 hinged between the side plates of the frame of the typewriter. The ends of the comb-plate are bent back upon ears for the hinged pintles. The axes of the pintles are about coincident with the key-lever fulcrums, and the hinged device may be swung down about its axis to disconnect any key-lever by pulling it off its fulcrum and removing it. When all the key-levers are in place, the

locking device may swing forwardly beneath the key-levers to lock the same against displacement, and this locking device may be held in normal position by means of a spring or springs and is readily manipulatable.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a fragmentary perspective view of an Underwood portable typewriting machine constructed according to my invention.

Figure 2 is a partial cross-sectional, front to rear, view of the structure shown in Figure 1.

Figure 3 is a plan view of a side wall blank from which a side wall used in practicing my invention is made.

Figure 4 is an operational view illustrating the removal of a key-lever.

Figure 5 is a diagrammatic perspective view illustrating the assembling of a segment-bracket member in an inner main frame employed in practicing my invention.

My invention is illustrated in connection with an Underwood portable typewriting machine and a carrying case for the same. Types 10 are mounted on type-bars 11, and are swung rearwardly against a platen 12 on a shaft 13, mounted in a carriage (not shown). Each type-bar 11 is pivoted about a curved fulcrum-rod 14, fast on a type-bar segment 15. Each type-bar is connected by a wire link 16 to a rear arm 17 of a bell-crank 18, which has a slotted forward arm 20. A pin 21, fast in the side of a key-lever 22, associated with each bell-crank 18, engages in the a slotted arm 20, and depression of a key 23 on each key-lever 22 swings the associated type 10 against the platen 12.

For guiding the key-levers 22 at the front in vertical planes, each lever moves up and down in vertical slots of a usual comb 25, which is fastened by screws 26 to inreaching lugs 27 integrally joined to the forward edge of an inner main frame, generally desgnated as 28. The comb 25 may have a usual lengthwise stiffening rib 29.

Heretofore, inner main frames of Underwood portable typewriters for supporting the operating mechanism have been madeof aluminum castings. It is a feature of the present invention to construct the inner main frame 28 of assembled sheet-steel parts stiffened by parts of the operating mechanism, and eliminate expensive machine operations heretofore necessary in assembling parts on aluminum main frames. The main frame 28 includes side walls or plates, generally designated as 30. Each side wall 30 is made from sheet-metal and has a developed form as shown in Figure 3, and has numerous projecting elements which are bent inwardly along fold-lines 31 by a forming operation to provide means for mounting various parts of the typewriting mechanism hereinafter described. Besides numerous small round holes which are provided for mounting and assembling purposes, three much larger apertures 32, 33 and 34 are provided in each side wall, which, besides considerably reducing the weight of the main frame, also provide openings through which access may be had to various parts of the operating mechanism for adjusting the same.

Each end of a sheet-steel rear wall 35 of the main frame 28 is fastened by rivets to an inwardly-bent flange-element 36 of the adjacent side wall 30. The upper edge portion of the rear wall 35 is bent rearward and forms a narrow stiffening flange 37. I

It is a feature of the present invention to arrange the wall 35 for serving as a fulcrum for the key-levers 22. To this end, a lower edge portion of the rear wall 35 extends below the flangeelements 36, and is bent forwardly a short distance and then downwardly. Each of the keylevers 22 has an upwardly-flared notch 38 cut in its upper edge, adjacent its rear end. The bottom of each notch 38 is rounded to permit easy rocking of the lever when the bottom of the notch engages against a bottom fulcrum-edge 40 of the rear wall 35. Return springs 41 for the keylevers 22 are mounted in a way to be presently described, and press each key-lever up against the fulcrum-edge 40.

It is another feature of the present invention to provide means for latching the rear end of each key-lever securely in position against the fulcrum-edge 40, which means are operable without removing any screws or other fastening devices, to permit removal of any key-lever such, for example, as might need repairing, and replacing it with another key-lever. To this end, the rear end of each key-lever has a rounded portion 42, as illustrated in Figure 4. A latch-plate 43, disposed in front of the rear wall 35, has a rearwardly-extending flange 44, at each end, which is apertured to be pivoted on an outreaching integral finger 45 on the adjacent end of the rear wall 35. A plurality of vertical slots 46 are provided in the latchplate 43, one for each key-lever 22, and each slot is made just wide enough to receive its associated key-lever with a working fit. The distance between two slots 46 is the same as the distance between the slots in the comb 25, so that the keylevers are held parallel and spaced equal distances apart. For adjusting the latch-plate 43 laterally, at the factory, so that a slot 46 for a certain key-lever is aligned with the slot in the comb 25 for the same lever, thereby preventing binding, each mounting flange 44 has an inturned spacing flange 47 for engagement against the adjacent side edge of the lower portion of the rear wall 35. The inner edges of the flanges 47 can be quickly adjusted by filing, to position the latch-plate 43 accurately, as regards lateral adjustment of the slots 46. For holding the latch-plate 43 in normal position, an outreaching integral finger 47 is provided on each end, above the pivoted flanges 44, and a tensile spring 48, at each end of the latch-plate, has one end fastened to the adjacent finger 47 and the other end fastened in a hole 49 in the rear wall 35. In the normal position of the latch-plate 43, a rearwardly-bent flange 50 on the bottom of the plate engages against the round end 7 42 of the key-lever 22 a short distance to the rear of the junction of its curved edge and the adjacent straight side of the key-lever.

To operate the latch-plate 43 for removing a l key-lever 22, a finger of the mechanic is pressed forwardly against a rearwardly-extending integral flange 51 at the top edge of the latch-plate 43.

The flange 50 is swung rearwardly enough to let the desired key-lever be pressed downwardly until the upper parts of the sides of the notches 33 are clear of the lower edge 40 of the rear wall 35, as illustrated in Figure 4. The key-lever 22 can then be pulled ahead lengthwise until it is clear of the comb 25 and thereafter the latch may be released, whereupon the springs 48 will swing it back to normal latching position.

To insert a key-lever 22, the latching plate 43 is swung to the Figure 4 position, and the rear end of the lever is pushed through its associated slot 46, and the latching plate is then released and the power of the springs 48 will swing the bottom of the latching plate forwardly and help to cam the rear end of the lever up against the fulcrum edge 40. The return spring 41 of the lever also presses the latter upward. It will be noted that when removing one key-lever andinserting another, the latch-plate 43 co-operating with the springs 41 and the comb 25 is effective to hold the other levers 22 in position without danger of them falling out of place, since the other levers still engage in the guide-slots 46. It will also be noticed that when the latch-plate 43 is swung to the Figure 4 position, it still controls the rear end of a key-lever being pressed downwardly for removal until the lever is pulled ahead.

The rear wall 35 of the inner frame is close to the rear wall 124 of the outer frame. The wall 35 is bent forwardly and then downwardly at its lower portion to form an offset stiffening flange,

the bottom edge of the flange constituting a fulcrum, up against which the springs 41 hold the notched key-levers, the rear ends of the key-levers being concealed by said rear outer wall 124, which extends below the level of the key-levers. The latching plate or cage 43 includes at its bottom a transverse bar 50, which underlies the levers to lock them against downward displacement as at 42. The cage is hinged at its ends 44 to swivel in a manner seen at Figure 4, to carry the rocking bar 50 rearwardly, and thereby free the levers, so that they may be withdrawn one by one. The spring 48 holds the cage in normal lever-locking position.

It is a feature of the present invention to mount certain usual stiff members of the operating mechanism of the typewriting machine between the thin sheet-metal side walls 30, so as to laterally brace and stiffen the latter. To this end, a usual cross-bar 55 for mounting the bell-cranks 18 having a. substantially rectangular cross-section and end portions 56 of reduced thickness is fastened between the side walls 30 by riveting each end portion to the under side of an inreaching integral mounting lug 5'7 of the adjacent side walls.

A lengthwise slot 58 is cut in the forward side of the bar 55. A plurality of crosswise slots 59 are cut through the bar 55 at the forward side of the same, one slot for each bell-crank 18 which is received with a sliding fit. The rear ends of each slot 59 slope upwardly and rearwardly, as shown in Figure 2. The depth of the slot 58 is such that a usual bell-crank fulcrum-rod 61 dis-.

posed against the bottom of the slot and engaging through usual pivot-holes provided in each bell-crank 18 normally supports the latter in Figure 2 position, wherein each rear arm 17 is disposed adjacent the bottom wall of each slot 59. The pins 21 in the key-levers 22 engage in the slotted arms 20 and hold the bell-cranks 18 in position in the slots 59, and also hold the fulcrum-rod 61 against the rear end of the slot 58. The forward end of each mounting lug is provided with two integral prongs 62 for fastening return springs 63 for operating parts of the typewriting machine.

To further brace the side walls 30, a segmentbracket member in the form of a stiff strong cross-bar, generally designated as 65, has a middle portion 66 to which the segment is rigidly fastened by screws 67 after the bar has been finished to size, so as to be interchangeable with different type-bar segments 15. From each side of the middle portion 66, the cross-bar 65 extends outwardly and forwardly to within a short distance of the side walls 30.- It then turns at right angles to the side walls 30 and extends thereagainst, and then turns again at right angles and terminates in two pad or foot elements 68 which engage against the side walls 30 adjacent their top edges. v

To fasten the feet 68 rigidly to the side walls 30, two threaded holes 69 are provided in each foot for receiving two screws '70, and two holes 71 are provided in each side wall 30 to register with the holes 69 in the adjacent foot 68 when the segment mounting bar 65 is in proper position on the main frame 28. The holes 71 are slightly larger than the stems of the screws 70, which permits a slight adjustment in any direction of the cross-bar 65 after the screws have been inserted through the holes '71 and have been partly screwed up in the feet 68. After the mounting bar 65 has been accurately positioned, the screws '70 are screwed up tightly, and two holes are drilled and taper reamed in each foot 68 while the latter is held tightly against the adjacent side wall 30. These reamed holes register with two holes 72 in the adjacent sidewall 30 which are also taper reamed simultaneously with the holes in the adjacent foot 68. A tapered dowel-pin 73 is driven tightly in the concentric hole in each foot, and its outer end is made substantially'flush with the outer face of the side wall 30. a

It is usual in constructing Underwood portable typewriting machines to mount the return springs 41 of the key-levers 22 on a channel-bar 7 5 transversely disposed to the key-levers below the same. It is a feature of the present invention to fasten the channel-bar on the main frame 28 as strongly as heretofore, while reducing the number of parts heretofore required for this work. To this end, two usual rear rubber shoes 76, disposed between the main frame 28 and'the usual baseboard or floor '77 which co-operates with a cover (not shown) to form a. usual carrying case for the type writing machine, are moved to the rear, so that a screw '78, which heretofore fastened each shoe 76 against the lower face of an inreaching flange 80 of the side walls, registers with the foremost of two tapped holes provided in each end portion 81 of the channel-bar '75, which end portions rest on the flanges 80.

The upper threaded end of each screw 78 is screwed into the foremost hole in the adjacent end.portion 81 and serves a double purpose by fastening the associated shoe 76 to the flange 80, and also helping to secure the channel-bar '75 to the flange 80. Additional screws 82 engage through holes in the flanges 80 and are threaded in concentric holes in the end portions 81 and help fasten the channel-bar 75 between the side walls 30.

The usual front cover-plate 84 has a rearwardly-extending flange 85 which conceals certain of the mechanism of the typewriting machine,'and also serves to stiffen the plate 84, which is fastened between the side walls 30 by screws 86 which pass through holes in the cover-plate member and engage in threaded holes in inreaching integral lugs 87 of the side walls 30. The cover-plate also has a forwardly-extending flange-element 88 til which helps tostiifen it.

It can be seen that by the above-described construction, the thin side walls 30 are laterally braced at several points by the cross-connecting members including the comb 25, the rear wall 35, the bell-crank mounting bar 55, the segmentmounting bar 65, the channel-bar 75 and the front cover-plate 84. The arrangement of these stiffening members rigidly fastened to each side wall 30, provides a strong rigid main frame which is less expensive to manufacture and lighter than an aluminum cast frame heretofore used. Moreover, each of the above-described cross-connecting members can be fastened to the main frame without requiring finishing operations on the frame or the member, and serves its main purpose well, besides stiffening and strengthening the main frame.

The provision of improved means for releasably fastening the inner main frame 28 to the baseboard 77 is a feature of the present invention. For fastening the frame 28 at each front corner to the baseboard 77, a fastening lug 90 is integrally joined to each side wall 30 at its forward end, and is bent inward along a fold-line 31 and outward along a fold line 31 to be disposed in front of the main frame 28. A relatively large round hole 91 is provided in each lug 90 for receiving with a snug fit a reduced neck-portion 92 of a round rubber shoe 93, the rim-portion of the lug 90 around the hole 91 being seated flatly on a shoulder 94 of the shoe. A rubber washer 95 rests on top of the rim-portion of each lug 90 and the top planes of the washers are disposed flush with the tops of the necks 92. Provision of the washers 95 produces advantages which will presently be described. A metallic washer 96 rests on each rubber washer 95. A shoulderscrew 97 passes through concentric round holes in each shoe 93, rubber washer 95 and metallic washer 96, and is threaded in a thimble-member 98 seated in thebaseboard 77, and fastens the front of the main frame to the baseboard 77.

Should a severe strain come on the heads of the screws 97 in a direction away from the baseboard 77, there would be danger of pulling the thimbles through the wooden baseboard, since the latter is made relatively thin for sake of lightness in weight. To relieve said strains, a compression spring 100 is disposed between the head of each screw 97 and its associated washer 96. To prevent a screw 97 from being threaded into its thimble 98 so far that the associated spring 100 is closed and its shock-absorbing ability is thereby destroyed, a truncated conical washer 101 is provided under each rubber shoe 93 for engaging the shoulder of the screw 97 and limiting the amount of compression of the spring 100. Each shoe 93 will be recessed in its lower side for en gaging snugly around the conical washer 101.

The arrangement of the rubber washer 95 between the metallic washer 96 and the-metallic foot lug 90 provides a vibration insulating member between the two metallic parts and makes for quieter operation of the machine. By making the shoe 93 and washer 95 in two separate parts, a simpler form of the foot 90 and the shoe 93 is provided than was heretofore used. Also the shoe 93 and the foot 90 can be assembled quickly.

The provision of means for fastening the rear of the main frame 28 to the baseboard 77, which will add to the appearance of the typewriting machine and permit shortening of the baseboard 77, is one aim of the present invention. To this end, an eye-piece or staple 105 is fastened by screws 106 to the baseboard 77, close up against a usual rear rim-element 107 of the same. The screws 106 are threaded into thimble anchorage members 108 set in the under side of the baseboard 77. A rubber sheathing member 109 is provided around the middle portion of the staple 105. A holding or looking piece 110 is fastened by screws 111 to the rear face of the rear wall 35 adjacent the flange 37 and extends downwardly adjacent the forward edge of the staple 105 and has a bolt-element 112 which projects rearwardly under the rubber sheathing member 109, being disposed tightly thereagainst. To release the locking piece 110 from the staple 105, the shoulder-screws 97 are first removed, and the forward end of the main frame is slightly raised and moved forward.

For pivoting members, such as usual key-levers 113 and shift-frame links 114, on the sheet-metal side walls 30, a shoulder bushing 115 for each such member may be riveted to the walls, the reduced portion of each bushing engaging in one of the holes provided for it when the side wall is blanked out. The shoulder of each bushing is seated against the inside face of the adjacent side wall 30. Each key-lever may be fulcrumed on a fillister head pin 116 inserted in the bore of an associated bushing 115 and held therein by a set-screw 117.

By making the walls 30 out of sheet-metal, lugs 118 for mounting therein usual stop-screws 119 for the shift-frame links 114 can be advantage ously provided by bending inward suitable earlike portions of the sheet-metal side walls. Also an opening, such as the opening 33, may be easily provided adjacent the screws 119, whereby convenient access to them may be hadfor adjustment purposes.

It is usual in the construction of an Underwood portable typewriting machine to securely fasten to the inner main frame 28 an outer ornamental cover frame 120 constructed substantially as shown and described in U. S. Patent No. 1,614,- 604, issued to me January 18, 1927. It is desirable to fasten the outer frame 120 to the inner main frame 28 to be readily releasable therefrom, since such outer frames are interchangeable on inner frames and removal of one outer frame from an inner frame and replacing it with another is sometimes required to be expeditiously done by a dealer who is not a skilled mechanic.

Heretofore, the outer frame 120 has been fastened at the rear and on both sides by steel screws which were threaded in holes tapped in the aluminum inner frame. The screw heretofore used to fasten the outer frame 120 to the inner frame 28 at the rear has sometimes become jammed or stuck and has been difficult to remove. It is a feature of the present invention to provide improved means for releasably fastening the outer frame to the inner frame wherein a minimum of screws is used and wherein such screws as are required are made of steel and are threaded in steel members of the inner frame. ing means include a stud 121 having an annular collar or head 122 intermediate its ends. One end of the stud or dowel extends outwardly and fits removably in a hole provided in the usual integral pad 123 on a rear wall 124 of the outer frame 120, and the other end of the stud engages in the hole extending through the locking piece 110 and the rear wall 35 of the inner main These fastenframe 28, which last-named hole registers with the hole in the pad 123.

For fastening the sides of the outer frame to the side walls 30, usual integral inreaching lugs on the bottom edges of side walls 126 of the outer frame 120 are fastened to integral inwardly-bent lugs 127 of the side walls 30 by upreaching steel screws 128 which pass through holes in the lugs 125 and are threaded in tapped holes in the lugs 127.

The dowel-pin 121 co-operates with the two side screws at 125, to fasten the inner frame to the outer frame, thus making a three-point fastening. The dowel-pin passes through the hole in the rear wall, and when the screws are fastened at 125, the frames become rigidly locked together to form a unit. When it is desired to take off the outer frame, the screws 128 are removed, and then the inner frame is pulled forwardly within the outer frame until the dowel-pin 121 comes out of the hole.

The outer frame 120 has a usual inreaching integral flange 130 along the upper edges of its side walls 126 and its front cross wall 131. The flange 130 on the cross wall 131 terminates a short distance from the foremost part (not shown) of the operating mechanism of the typewriting machine, to permit a short forward movement of the inner frame 28 and the operating mechanism of the typewriter relative to the outer frame 120 for disengaging the stud 121. The rear wall 124 of the outer frame 120 has a portion cut away opposite the staple 105, so that the rear wall may be moved over the staple 105, when the bolt 112 is withdrawn from the staple upon forward movement of the inner frame 28. It will be noted from inspection of Figure 2 that the rear face of the rear wall 124 is in the same plane as the rear edge of the staple 105 which is set against the rim 107 of the baseboard 77. This arrangement substantially conceals all of the parts which function to lock the main frame 28 to the baseboard. I

The machine is held to the baseboard '77 by fastening means 97, 98, at the sides of the machine at its front portion, and also by a third member which is at the n' iddle at the rear of the machine, and is in the nature of a transverse staple 105, which, at its ends, is fastened downwardly at the baseboard, and a hook is fast to the framework at the rear, and has a downwardly-extending shank 110, which terminates in a tongue 112, catching under the staple 105 to a tooth below the framework, the front fastening means 9'7 being detachable to permit the machine to slide forwardly to withdraw the tongue from the staple. The front end of the machine is tipped up a little preparatory to withdrawing the tongue from the staple, so as to clear the rubber feet from the depressions in the baseboard. A length of soft rubber 109 is fitted upon the staple to contact with the tongue 112, thus providing a sound insulation between the typewriting machine and the baseboard.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination with an inner frame for supporting the mechanism of said machine, an outer decorative frame releasably mounted on said inner frame for concealing the same, and a baseboard for supporting said inner frame, of substantially concealed releasable means for fastening the rear end of said frame to said baseboard, said means including a. keeper-member fastened to said baseboard in front of the plane of the rear face of said outer frame. and a locking member fastened to the rear of said inner frame and having a rearward bolt-like extension extending under said keeper and terminating even with the rear wall of said outer frame, said outer frame arranged for engaging closely said keeper-member, whereby to substantially conceal it, said outer member slidable forwardly over said keeper as said inner frame is moved forward to withdraw said bolt-extension from said keeper.

2. In a portable typewriting machine, an inner frame for supporting the operating mechanism, an outer decorative frame fitting over and concealing the inner frame, said frames having sides and rear walls, a dowel-pin in the rear wall of the inner frame and projecting loosely into a dowel-hole formed in the .rear wall of the outer frame, said dowel pin being provided with means engaging both said walls to prevent relative movement therebetween when'in assembled position and screws connecting said sides together near the forward part of the machine, said-dowel and said screws co-operating to hold said frames rigidly together to form a unitary structure, the inner frame having a suflicient range of movement forwardly within the outer frame when said screws are removed, to permit the dowel to be withdrawn from the hole in the outer rear wall, whereby the outer frame is rendered removable from the inner frame.

3. In a typewriting machine, an inner frame for supporting the operating mechanism and having a rear part with a hole therein, an outer surrounding decorative frame also having a rear part with a hole therein, means to fasten the side portions of the frames together and a pin in said holes having an enlargement held between said rear portions.

WILLIAM A. DOBSON. 

